Perhaps you should try some spelling variations:
doanh van » doan van, doanh va, doanh ban
hieu van » thien van, lieu va, hieu ve
lam duoc » nam duoc, luat duoc, lam thuoc
va doanh » van doanh, vay doanh, va danh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang xa hoi. ((hieu van) OR (hieu va)) ((lam duoc) OR (am thuc)) va doanh van cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang xa hoi. ((hieu van) OR (hieu va)) ((lam duoc) or (am thuc)) va doanh van cua tre~".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang xa hoi. ((hieu van) OR (hieu va)) ((lam duoc) or (am thuc)) va doanh van cua tre*.